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><A
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>6.4. Experimental API Elements</A
></H1
><P
>The following V4L2 API elements are currently experimental
and may change in the future.</P
><P
></P
><UL
><LI
><P
>Video Output Overlay (OSD) Interface, <A
HREF="x6909.htm"
>Section 4.4</A
>.</P
></LI
><LI
><P
><CODE
CLASS="CONSTANT"
>V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY</CODE
>,
        enum&nbsp;<A
HREF="x5953.htm#V4L2-BUF-TYPE"
>v4l2_buf_type</A
>, <A
HREF="x5953.htm#V4L2-BUF-TYPE"
>Table 3-2</A
>.</P
></LI
><LI
><P
><CODE
CLASS="CONSTANT"
>V4L2_CAP_VIDEO_OUTPUT_OVERLAY</CODE
>,
<A
HREF="r13105.htm"
><CODE
CLASS="CONSTANT"
>VIDIOC_QUERYCAP</CODE
></A
> ioctl, <A
HREF="r13105.htm#DEVICE-CAPABILITIES"
>Table 2</A
>.</P
></LI
><LI
><P
><A
HREF="r8494.htm"
><CODE
CLASS="CONSTANT"
>VIDIOC_ENUM_FRAMESIZES</CODE
></A
> and
<A
HREF="r8724.htm"
><CODE
CLASS="CONSTANT"
>VIDIOC_ENUM_FRAMEINTERVALS</CODE
></A
> ioctls.</P
></LI
><LI
><P
><A
HREF="r10211.htm"
><CODE
CLASS="CONSTANT"
>VIDIOC_G_ENC_INDEX</CODE
></A
> ioctl.</P
></LI
><LI
><P
><A
HREF="r8087.htm"
><CODE
CLASS="CONSTANT"
>VIDIOC_ENCODER_CMD</CODE
></A
> and <A
HREF="r8087.htm"
><CODE
CLASS="CONSTANT"
>VIDIOC_TRY_ENCODER_CMD</CODE
></A
>
ioctls.</P
></LI
><LI
><P
><A
HREF="r7900.htm"
><CODE
CLASS="CONSTANT"
>VIDIOC_DBG_G_REGISTER</CODE
></A
> and <A
HREF="r7900.htm"
><CODE
CLASS="CONSTANT"
>VIDIOC_DBG_S_REGISTER</CODE
></A
>
ioctls.</P
></LI
><LI
><P
><A
HREF="r9804.htm"
><CODE
CLASS="CONSTANT"
>VIDIOC_G_CHIP_IDENT</CODE
></A
> ioctl.</P
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